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cmake: Add make_cpio, a script for generating reproducible cpio(5) archives #67

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cmake: Add make_cpio, a script for generating reproducible cpio(5) archives #67

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Commits on Dec 7, 2021

  1. cmake,cpio: Move cpio(5) archive generation mechanism into script 

    Move the process of constructing an archive out into a new Python script
`make_cpio.py', and simplify the mechanism by directly using libarchive
to generate a file with the desired properties.

(I've previously run afoul of GNU cpio(1)'s `--reproducible' flag and
the detection machinery thereof; and of subtle and tricky-to-debug build
failures that occur partway through the generated command line.  I opted
to rework the CMake into Python; the result is that the CMake here
simplifies to the invocation of a single, fairly simple tool with
appropriate arguments, instead of the composition of a fairly involved
shell script.)

r2: `cmake-format'.

r3: rebased, and reworded commit message to more clearly explain the
    rationale for the change, as this was open to misinterpretation.

Signed-off-by: Jashank Jeremy <[email protected]>
    @jashank
    jashank committed Dec 7, 2021
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